#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<vector<int>> VII;
typedef vector<vector<ll>> VLL;
typedef vector<string> VS;

#define pii pair<int,int>
#define pll pair<ll,ll>
#define pis pair<int,string>
#define psi pair<string,int>
#define rep(i,num,n) for(int i=num;i<(int)(n);i++) //for_loop
#define rrep(i,num,n) for(int i=num-1;i>=(int)(n);i--) //reverse_for>
#define in(x,a,b) (a<=x && x<b)//範囲
#define reo return 0
#define all(v) v.begin(),v.end()
#define INF 2000000000
#define INFL 9000000000000000000

const long double pi = 3.1415926535897932384626433832795028841971L;
const ll MOD=1000000007;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }


int main(){
    ll N,A,B,C;cin>>N>>A>>B>>C;
    ll a,b,c;
    a=N/A,b=N/B,c=N/C;
    ll AB,BC,CA,ABC;
    ll ab,bc,ca,abc;
    AB=A*B/gcd(A,B),BC=B*C/gcd(B,C),CA=C*A/gcd(C,A);
    ab=N/AB,bc=N/BC,ca=N/CA;
    ABC=A*BC/gcd(A,BC);
    abc=N/ABC;
    ll ans=a+b+c-ab-bc-ca+abc;
    cout<<ans<<endl;
    }